program: io_uring_setup(0x70fa, &(0x7f0000000440)={0x0, 0x4ef1, 0x4000, 0x400001, 0x2e0}) mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff) mount(0x0, &(0x7f0000000040)='./sys\x00', &(0x7f0000000080)='sysfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./dev\x00', 0x1ff) mount(0x0, &(0x7f0000000100)='./dev\x00', &(0x7f0000000140)='devtmpfs\x00', 0x0, 0x0) r0 = openat(0xffffffffffffff9c, &(0x7f0000000180)='./sys/module/md_mod/parameters/new_array\x00', 0x1, 0x0) write(r0, &(0x7f0000000200)='md0', 0x3) r1 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./dev/md0\x00', 0x105042, 0x0) ioctl(r1, 0x40480923, &(0x7f0000000380)="000000000000000000000000000000000a000000000400000200000002000000000000000100000000000000000000000000000000000000000000000000000002010000000001") ioctl(r1, 0x40140921, &(0x7f0000000420)="0100000001000000010000000100000006") ioctl(r1, 0x400c0930, 0x0) ioctl(r1, 0x40140921, &(0x7f0000000440)="020000000100") [ 102.304373][ T5283] Bluetooth: hci0: command tx timeout [ 102.449749][ T5324] md: async del_gendisk mode will be removed in future, please upgrade to mdadm-4.5+ [ 102.451592][ T5325] md: async del_gendisk mode will be removed in future, please upgrade to mdadm-4.5+ [ 102.451723][ T5325] block device autoloading is deprecated and will be removed. [ 102.555075][ T5324] md/raid10:md0: not clean -- starting background reconstruction [ 102.555091][ T5324] md/raid10:md0: active with 1 out of 2 devices [ 102.555924][ T5324] md0: detected capacity change from 0 to 2048 [ 102.575173][ T5325] [ 102.576277][ T5325] ====================================================== [ 102.579232][ T5325] WARNING: possible circular locking dependency detected [ 102.582170][ T5325] syzkaller #0 Not tainted [ 102.584116][ T5325] ------------------------------------------------------ [ 102.587194][ T5325] syz.0.0/5325 is trying to acquire lock: [ 102.589617][ T5325] ffffffff8f556960 (major_names_lock){+.+.}-{4:4}, at: blk_request_module+0x35/0x2a0 [ 102.593731][ T5325] [ 102.593731][ T5325] but task is already holding lock: [ 102.596709][ T5325] ffff888012a8c358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_suspend_and_lock+0x48/0xf0 [ 102.601201][ T5325] [ 102.601201][ T5325] which lock already depends on the new lock. [ 102.601201][ T5325] [ 102.606205][ T5325] [ 102.606205][ T5325] the existing dependency chain (in reverse order) is: [ 102.610262][ T5325] [ 102.610262][ T5325] -> #3 (&mddev->reconfig_mutex){+.+.}-{4:4}: [ 102.613747][ T5325] __mutex_lock+0x19d/0x1550 [ 102.616059][ T5325] md_start_sync+0x179/0x1010 [ 102.618248][ T5325] process_scheduled_works+0xc3d/0x1630 [ 102.620940][ T5325] worker_thread+0xa47/0xfb0 [ 102.623336][ T5325] kthread+0x38b/0x480 [ 102.625393][ T5325] ret_from_fork+0x514/0xb70 [ 102.627595][ T5325] ret_from_fork_asm+0x1a/0x30 [ 102.629718][ T5325] [ 102.629718][ T5325] -> #2 ((work_completion)(&mddev->sync_work)){+.+.}-{0:0}: [ 102.633601][ T5325] process_scheduled_works+0xc03/0x1630 [ 102.635939][ T5325] worker_thread+0xa47/0xfb0 [ 102.638126][ T5325] kthread+0x38b/0x480 [ 102.640202][ T5325] ret_from_fork+0x514/0xb70 [ 102.642405][ T5325] ret_from_fork_asm+0x1a/0x30 [ 102.644698][ T5325] [ 102.644698][ T5325] -> #1 ((wq_completion)md_misc){+.+.}-{0:0}: [ 102.648255][ T5325] touch_wq_lockdep_map+0xcb/0x180 [ 102.650685][ T5325] __flush_workqueue+0x148/0x1470 [ 102.652981][ T5325] md_alloc+0x32/0xf20 [ 102.655003][ T5325] md_alloc_and_put+0x1a/0x1f0 [ 102.657374][ T5325] blk_request_module+0x27d/0x2a0 [ 102.659777][ T5325] blkdev_get_no_open+0x3f/0xe0 [ 102.662041][ T5325] blkdev_open+0x1d7/0x600 [ 102.664252][ T5325] do_dentry_open+0x816/0x1380 [ 102.666790][ T5325] vfs_open+0x3b/0x340 [ 102.668834][ T5325] path_openat+0x1443/0x1d60 [ 102.671121][ T5325] do_file_open+0x23e/0x4a0 [ 102.673390][ T5325] do_sys_openat2+0x115/0x200 [ 102.675606][ T5325] __x64_sys_openat+0x138/0x170 [ 102.678035][ T5325] do_syscall_64+0x166/0x520 [ 102.680363][ T5325] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 102.683295][ T5325] [ 102.683295][ T5325] -> #0 (major_names_lock){+.+.}-{4:4}: [ 102.686836][ T5325] __lock_acquire+0x164c/0x2de0 [ 102.689263][ T5325] lock_acquire+0x115/0x350 [ 102.691901][ T5325] __mutex_lock+0x19d/0x1550 [ 102.694570][ T5325] blk_request_module+0x35/0x2a0 [ 102.697054][ T5325] blkdev_get_no_open+0x3f/0xe0 [ 102.699370][ T5325] bdev_file_open_by_dev+0xa0/0x240 [ 102.701843][ T5325] md_import_device+0x2e9/0x650 [ 102.704256][ T5325] md_add_new_disk+0x669/0x1850 [ 102.707938][ T5325] md_ioctl+0x200a/0x2610 [ 102.710251][ T5325] blkdev_ioctl+0x5e3/0x740 [ 102.712417][ T5325] __se_sys_ioctl+0xfc/0x170 [ 102.714691][ T5325] do_syscall_64+0x166/0x520 [ 102.717011][ T5325] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 102.719829][ T5325] [ 102.719829][ T5325] other info that might help us debug this: [ 102.719829][ T5325] [ 102.724157][ T5325] Chain exists of: [ 102.724157][ T5325] major_names_lock --> (work_completion)(&mddev->sync_work) --> &mddev->reconfig_mutex [ 102.724157][ T5325] [ 102.730739][ T5325] Possible unsafe locking scenario: [ 102.730739][ T5325] [ 102.733888][ T5325] CPU0 CPU1 [ 102.736178][ T5325] ---- ---- [ 102.738551][ T5325] lock(&mddev->reconfig_mutex); [ 102.740763][ T5325] lock((work_completion)(&mddev->sync_work)); [ 102.744661][ T5325] lock(&mddev->reconfig_mutex); [ 102.747940][ T5325] lock(major_names_lock); [ 102.749940][ T5325] [ 102.749940][ T5325] *** DEADLOCK *** [ 102.749940][ T5325] [ 102.753416][ T5325] locks held by syz.0.0/5325: 1, last CPU#0: [ 102.756032][ T5325] #0: ffff888012a8c358 (&mddev->reconfig_mutex){+.+.}-{4:4}, at: mddev_suspend_and_lock+0x48/0xf0 [ 102.760488][ T5325] [ 102.760488][ T5325] stack backtrace: [ 102.763062][ T5325] CPU: 0 UID: 0 PID: 5325 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 102.767073][ T5325] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 102.771365][ T5325] Call Trace: [ 102.772859][ T5325] [ 102.774189][ T5325] dump_stack_lvl+0xe8/0x150 [ 102.776450][ T5325] print_circular_bug+0x2e2/0x300 [ 102.778681][ T5325] check_noncircular+0x12f/0x150 [ 102.780798][ T5325] __lock_acquire+0x164c/0x2de0 [ 102.782928][ T5325] ? post_alloc_hook+0x208/0x250 [ 102.784998][ T5325] ? get_page_from_freelist+0x2209/0x2280 [ 102.787448][ T5325] lock_acquire+0x115/0x350 [ 102.789413][ T5325] ? blk_request_module+0x35/0x2a0 [ 102.791602][ T5325] __mutex_lock+0x19d/0x1550 [ 102.793591][ T5325] ? blk_request_module+0x35/0x2a0 [ 102.795748][ T5325] ? lock_acquire+0x115/0x350 [ 102.797717][ T5325] ? blk_request_module+0x35/0x2a0 [ 102.799876][ T5325] ? __pfx___mutex_lock+0x10/0x10 [ 102.802034][ T5325] ? find_inode_fast+0x5dc/0x740 [ 102.804127][ T5325] ? find_inode_fast+0xd2/0x740 [ 102.806221][ T5325] blk_request_module+0x35/0x2a0 [ 102.808319][ T5325] blkdev_get_no_open+0x3f/0xe0 [ 102.810401][ T5325] bdev_file_open_by_dev+0xa0/0x240 [ 102.812687][ T5325] md_import_device+0x2e9/0x650 [ 102.814936][ T5325] md_add_new_disk+0x669/0x1850 [ 102.817045][ T5325] md_ioctl+0x200a/0x2610 [ 102.818840][ T5325] ? tomoyo_path_number_perm+0x219/0x5f0 [ 102.821185][ T5325] ? __pfx_md_ioctl+0x10/0x10 [ 102.823185][ T5325] ? do_vfs_ioctl+0x116f/0x1530 [ 102.825231][ T5325] ? __pfx_do_vfs_ioctl+0x10/0x10 [ 102.827406][ T5325] ? hook_file_ioctl+0x1f2/0x600 [ 102.829529][ T5325] ? __pfx_md_ioctl+0x10/0x10 [ 102.831501][ T5325] blkdev_ioctl+0x5e3/0x740 [ 102.833428][ T5325] ? __pfx_blkdev_ioctl+0x10/0x10 [ 102.835625][ T5325] ? __fget_files+0x2a/0x420 [ 102.837546][ T5325] ? bpf_lsm_file_ioctl+0x9/0x20 [ 102.840311][ T5325] ? __pfx_blkdev_ioctl+0x10/0x10 [ 102.842420][ T5325] __se_sys_ioctl+0xfc/0x170 [ 102.844388][ T5325] do_syscall_64+0x166/0x520 [ 102.846380][ T5325] ? trace_irq_disable+0x3b/0x140 [ 102.848509][ T5325] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 102.851130][ T5325] ? clear_bhb_loop+0x70/0xc0 [ 102.853157][ T5325] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 102.855692][ T5325] RIP: 0033:0x7fc961b9e159 [ 102.857526][ T5325] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 [ 102.865330][ T5325] RSP: 002b:00007fc962a3afe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 102.868889][ T5325] RAX: ffffffffffffffda RBX: 00007fc961e26090 RCX: 00007fc961b9e159 [ 102.872301][ T5325] RDX: 0000200000000440 RSI: 0000000040140921 RDI: 0000000000000004 [ 102.875650][ T5325] RBP: 00007fc961c3506b R08: 0000000000000000 R09: 0000000000000000 [ 102.878959][ T5325] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 102.882308][ T5325] R13: 00007fc961e26128 R14: 00007fc961e26090 R15: 00007ffea2aa8c18 [ 102.885732][ T5325] [ 102.925242][ T5325] block device autoloading is deprecated and will be removed. [ 102.926034][ T5328] md: resync of RAID array md0 [ 102.966762][ T5328] md: md0: resync done.